Electrical
26 Design Guide
3.4.2 +5VSB Fall Time - Recommendation
Power supply 5VSB is recommended to go down to low level within 2 seconds under
any load condition after AC power is removed as shown in Figure 3-7
. Intel
®
test plan
will test at Light 20% Load. If system requires specific +5VSB fall time, the PSU design
is recommended to support it.
Figure 3-7: 5VSB Fall Time
3.5 Output Protection
3.5.1 Over Voltage Protection (OVP) – Required
The over voltage sense circuitry and reference shall reside in packages that are
separate and distinct from the regulator control circuitry and reference. No single point
fault shall be able to cause a sustained over voltage condition on any or all outputs.
The supply shall provide latch-mode over voltage protection as defined in Table 3-11
.
Table 3-11: Over Voltage Protection
Output Minimum (V) Nominal (V) Maximum (V)
+12 VDC
(or 12V1DC and 12V2DC)
13.4 15.0 15.6
+5VDC 5.74 6.3 7.0
+3.3VDC 3.76 4.2 4.3
+5VSB
1
5.74 6.3 7.0
NOTE:
1
Over voltage protection is RECOMMENDED but not REQUIRED for this output. While over
voltage protection is not required for this output, system damage may occur in the case
of an over voltage event.
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